Bamse's friends go on a quest to find the Thunderbell, the ingredient that makes Bamse strong. Meanwhile, the sly Reinard pretends to be a good guy to supplant Bamse as the hero of the town and win the affections of Mickelina.
Sweden's most popular comic book character - the bear Bamse - will now get his first own feature film. In "Bamse and the city of thieves" the strongest bear in the world and his two friends Little Hopp and Shellman show that the best weapon against evil is -friendship (and a few drops of Grandma's Thunder Honey of course).
In Bamse and the Witch’s daughter Croesus Vole finds gold in the beavers' dam. To demolish the dam and get the gold he tricks the witch's daughter Lova to enchant Bamse. With Bamse gone, it's up to the children to help each other to stop Croesus - but to do that they have to be friends.
